Well when you play league you may be in your PJ's or you may be having yourself leaned back in a chair or even sliding your hand over the house. When i play LoL i noticed i do better when I'm dressed properly (like when I'm not in my PJ's)I just do better overall. Also when i am in my chair properly back straight and feet on the floor i do better (who cares about posture in League?) Well when your game-play becomes better because of posture and taking this into a serious matter you'll care as well. Same thing goes with your mouse sometimes you DON'T have your hand in a position on the mouse where your hand cannot react as fast (Either its slide back, or its slide forth) it should be in a proper position. Some may look at this and dismiss it,but try it for yourself you may find posture is a main MUST in LoL.